Unit 5 Post Test Atom and the Periodic Table

Which of these elements is a metal?

• hafnium (Hf)

• radon (Rn)

• silicon (Si)

• sulfur (S)

• selenium (Se)

Which of the following elements is a noble gas?

• A) Ar

• B) Na

• C) Mg

• D) S

Select the correct locations on the periodic table. Which two elements have similar characteristics?

• Hydrogen and Helium

• Sodium and Potassium

• Carbon and Oxygen

• Magnesium and Chlorine

Which of these elements has two electrons in its outer p orbitals?

• helium (He)

• barium (Ba)

• nitrogen (N)

• silicon (Si)

• sulfur (S)

Fill in the blank: The symbol for the element Gold is _____

• Au

• Ag

• Fe

• Pb

Read the information about the three atoms given in the table. Which of them are isotopes of each other?

• A. X and Y

• B. X and Z

• C. Y and Z

• D. X, Y, and Z

• E. there are no isotopes among these atoms

• gamma rays

• visible light

• microwaves

• radio waves

• x-rays

Which is a factor in determining the average atomic mass of an element?

• atomic number of the most abundant isotope

• relative abundance of each isotope

• sum of atomic masses of all isotopes

• product of atomic masses of all isotopes

• arithmetic mean of atomic masses of the isotopes

Thallium consists of 29.5% Tl-203 and 70.5% Tl-205. What is the relative atomic mass of thallium?

• 203 amu

• 204 amu

• 203.5 amu

• 205.3 amu

• 204.4 amu

The image shows a portion of the periodic table. Which two elements have similar characteristics?

• neon and fluorine

• chlorine and sulfur

• fluorine and chlorine

• oxygen and chlorine

• argon and fluorine